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Faced with the fact that when changing the version of php on the hosting, at the entrance to the admin panel of Opencart there is only a white screen.

Sometimes there is an error 500.

This is due to the cache of Opencart.

Returning the version of php, for example, was 7.0; then we enter the Opencart admin area.

 belyj ekran pri vkhode v adminku opencart 001

In the control panel, click the gear in the upper right corner.

belyj ekran pri vkhode v adminku opencart 002

Clear the cache.

Without closing the admin panel, we change the php version to a new one, for example, from 7.0.na 7.1.

We use.

Unfortunately, this procedure will have to be done on each computer that was used to log in to the admin area.